Pearl River Water Hardness & Quality Report (2026)

The Pearl River Water Department provides water to about 8,000 residents in Rockland County, New York. Their supply comes from local reservoirs and streams within the Mahwah River watershed, with additional water purchased from the Hackensack Water Company and through interconnections with the Spring Valley system. Treatment takes place at the village's filtration plant, where processes like coagulation, sedimentation, filtration, and chlorination are used to meet state standards. This water supply is a blend of surface water from the Hudson River basin and a small amount of groundwater from regional aquifers.

The watershed includes the Ramapo River sub-basin within the larger Hudson River drainage. This area is characterized by metamorphic and sedimentary rocks from the Paleozoic era, such as schists, gneisses, and carbonate layers dating back to the Ordovician and Cambrian periods. Specifically, dolomitic limestones contribute to the water's moderately mineralized quality through the natural dissolution of alkaline earth metals. The combination of different water sources helps to moderate any extreme mineral content, resulting in a balanced supply influenced by the region's glaciated landscape and fractured bedrock aquifers.

Homeowners in Pearl River may notice moderate scale buildup in appliances like water heaters, dishwashers, and washing machines, which can reduce their efficiency and leave spots on glassware. You might also see limescale on plumbing fixtures, and laundry could feel stiff without the help of softeners. To combat this, regular maintenance is advised, such as monthly descaling of faucets and coffee makers with vinegar and using rinse aids in dishwashers. An annual inspection of water heaters is also recommended. For those experiencing these issues, installing a water softener could extend appliance life and improve cleaning results.